October 2005, V4#10: Define Thursday, Jan 29 2009 

Paper Opacity: property which minimized to “show through” of printing from the book side of the next sheet.

Uncoated: Paper with no surface treatment; the printing surface is the stock itself.

Absorbent Paper (see Paper): Covering a variety of papers made for absorbing water and inks (degrees vary).  Examples: duplicating, filter, blotting and toweling papers.

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September 2005, V4#9: Production Thursday, Jan 29 2009 

A Little About Archival Quality

Internal Factors

The Gregath Publishing Company has a standard paper basis that all quotations and projects are based on unless the customer requests something different.  Our standard fine text paper is a 20/50#, uncoated, white, acid free paper.  This paper meets American National Standards Institute specifications for “Permanence of Paper”.  The paper is manufactured with chemical pulp under alkaline conditions.  Being of a very high benchmark (various ANSI and National Information Standards Organization standards), this paper meets these four basic requirements:

  • pH of 7.5-10 (balanced to archival)

  • A tear resistance of md index>5.25mNm2/6g which corresponds to a minimum of 40 gf.

  • Alkaline reserve: minimum of 2% calcium carbonate equivalent (buffered)

  • Less than 1% lignin (acidic)

This paper also earns “high” to “maximum” life expectancy for “Copies for Office Copying Machines” as established by ASTM International (formerly American Society for Testing and Materials).  This typically applies to xerocopy and digital grades.  While we have yet to find a published expected life span for permanent papers, ASTM suggests in their specification that paper meeting the high classification of this standard may be “usable” for 100 to 1,000 years.  Please note that the ASTM suggestion of usable means it can still be reproduced upon.  A reader can enjoy books printed on paper that is way past this “usable” stage of it’s life.

April 2005, V4#4: Production Wednesday, Jan 28 2009 

Most of the work Gregath Publishing Company does in-house is offset printed.  We offset print on uncoated papers.  Uncoated papers have been traditionally classified by weight.  Interest has begun to increase also as to the brightness as well as archival nature.  As publishers, we have selected as our basis paper one that balances all of these issues while taking into account economy as well.  If a customer has a list of specifics, or even a particular brand/type of paper, we are happy to get paper mill quotes and pass the information on. 

Gregath’s standard book paper is a #50/60 uncoated white paper, acid free with a brightness of 84% – long grain.

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This section is drawn from information online at http://www.gregathcompany.com/paper.html